/* roulang page: index */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-soft: #dbeafe;
            --secondary: #06b6d4;
            --secondary-dark: #0891b2;
            --accent: #10b981;
            --dark: #0f172a;
            --dark-2: #1e293b;
            --text: #1e293b;
            --text-2: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --card-bg: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-xs: 4px;
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 48px rgba(0,0,0,0.13), 0 8px 16px rgba(0,0,0,0.06);
            --transition: 0.2s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --max-width: 1200px;
            --header-height: 68px;
        }

        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}
        body{font-family:var(--font-sans);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}
        img{max-width:100%;height:auto;display:block}
        a{text-decoration:none;color:inherit;transition:color var(--transition)}
        button,input,select,textarea{font:inherit;color:inherit;border:none;outline:none;background:none}
        button{cursor:pointer}
        ul,ol{list-style:none}
        h1,h2,h3,h4,h5,h6{line-height:1.25;font-weight:700;color:var(--dark)}
        :focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:var(--radius-xs)}

        .container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
        @media(max-width:768px){.container{padding:0 16px}}

        /* Header */
        .header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);height:var(--header-height);transition:box-shadow var(--transition)}
        .header.scrolled{box-shadow:var(--shadow)}
        .header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
        @media(max-width:768px){.header-inner{padding:0 16px}}

        .logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;color:var(--dark);letter-spacing:-0.02em;white-space:nowrap;flex-shrink:0}
        .logo-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;flex-shrink:0}
        .logo:hover{color:var(--primary)}
        .logo:hover .logo-icon{transform:scale(1.05);transition:transform var(--transition)}

        .nav-desktop{display:flex;align-items:center;gap:6px}
        .nav-link{position:relative;display:inline-flex;align-items:center;gap:5px;padding:10px 16px;border-radius:var(--radius);font-weight:600;font-size:0.95rem;color:var(--text-2);transition:all var(--transition);white-space:nowrap}
        .nav-link:hover{color:var(--primary);background:var(--primary-soft)}
        .nav-link.active{color:var(--primary);background:var(--primary-soft)}
        .nav-link .fa-chevron-down{font-size:0.65rem;transition:transform var(--transition)}
        .nav-mega{position:relative}
        .nav-mega:hover .nav-link .fa-chevron-down{transform:rotate(180deg)}
        .nav-mega:hover .mega-panel{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}

        .mega-panel{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:24px;min-width:520px;opacity:0;visibility:hidden;transition:all var(--transition-slow);pointer-events:none;z-index:999}
        .mega-panel::before{content:'';position:absolute;top:-8px;left:50%;transform:translateX(-50%);width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;border-bottom:8px solid var(--card-bg)}
        .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
        .mega-card{display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:var(--radius);background:var(--bg);transition:all var(--transition);border:1px solid transparent}
        .mega-card:hover{background:var(--primary-soft);border-color:var(--primary-light);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
        .mega-card-icon{width:42px;height:42px;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--primary),var(--primary-dark));display:flex;align-items:center;justify-content:center;color:#fff;font-size:1rem;flex-shrink:0}
        .mega-card-info h4{font-size:0.9rem;font-weight:700;color:var(--dark);margin-bottom:2px}
        .mega-card-info span{font-size:0.78rem;color:var(--text-muted)}

        .header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
        .btn{display:inline-flex;align-items:center;gap:7px;padding:10px 20px;border-radius:var(--radius);font-weight:600;font-size:0.9rem;transition:all var(--transition);white-space:nowrap;letter-spacing:0.01em}
        .btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px rgba(37,99,235,0.25)}
        .btn-primary:hover{background:var(--primary-dark);box-shadow:0 4px 16px rgba(37,99,235,0.35);transform:translateY(-1px)}
        .btn-primary:active{transform:translateY(0);box-shadow:0 1px 4px rgba(37,99,235,0.2)}
        .btn-outline{border:2px solid var(--border);color:var(--text-2);background:transparent}
        .btn-outline:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}
        .btn-lg{padding:14px 28px;font-size:1rem;border-radius:var(--radius-lg)}
        .btn-sm{padding:7px 14px;font-size:0.82rem;border-radius:var(--radius-sm)}

        .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:var(--radius-sm);cursor:pointer;z-index:1001}
        .hamburger span{width:24px;height:2.5px;background:var(--dark);border-radius:2px;transition:all var(--transition)}
        .hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
        .hamburger.active span:nth-child(2){opacity:0}
        .hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
        @media(max-width:768px){.nav-desktop{display:none}.header-actions .btn{display:none}.hamburger{display:flex}.header-actions{gap:0}}

        .mobile-menu{display:none;position:fixed;top:var(--header-height);left:0;right:0;bottom:0;background:var(--card-bg);z-index:998;padding:20px 16px;overflow-y:auto;flex-direction:column;gap:8px}
        .mobile-menu.active{display:flex}
        .mobile-menu .nav-link{font-size:1.05rem;padding:14px 16px;border-radius:var(--radius);width:100%}
        .mobile-menu .mega-grid{grid-template-columns:1fr;gap:8px}
        .mobile-menu .mega-panel{position:static;opacity:1;visibility:visible;transform:none;min-width:auto;box-shadow:none;border:none;padding:12px 0;pointer-events:auto;background:transparent}
        .mobile-menu .mega-panel::before{display:none}
        .mobile-menu .header-actions-mobile{margin-top:12px;display:flex;flex-direction:column;gap:10px}
        .mobile-menu .header-actions-mobile .btn{width:100%;justify-content:center}

        /* Hero */
        .hero{position:relative;padding:80px 0 90px;background:linear-gradient(160deg,#0f172a 0%,#1e3a5f 40%,#1a2744 100%);overflow:hidden;min-height:560px;display:flex;align-items:center}
        .hero-bg{position:absolute;inset:0;z-index:0;opacity:0.35}
        .hero-bg img{width:100%;height:100%;object-fit:cover}
        .hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,23,42,0.55) 0%,rgba(15,23,42,0.78) 60%,rgba(15,23,42,0.9) 100%);z-index:1}
        .hero-glow{position:absolute;top:-120px;right:-80px;width:500px;height:500px;background:radial-gradient(circle,rgba(37,99,235,0.3) 0%,transparent 70%);z-index:1;pointer-events:none}
        .hero-glow-2{position:absolute;bottom:-100px;left:-60px;width:400px;height:400px;background:radial-gradient(circle,rgba(6,182,212,0.25) 0%,transparent 70%);z-index:1;pointer-events:none}
        .hero .container{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
        @media(max-width:900px){.hero .container{grid-template-columns:1fr;text-align:center;gap:32px}.hero{padding:50px 0 60px;min-height:auto}}
        .hero-content{max-width:560px}
        @media(max-width:900px){.hero-content{max-width:100%;margin:0 auto}}
        .hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(37,99,235,0.2);border:1px solid rgba(37,99,235,0.4);color:#93c5fd;padding:7px 15px;border-radius:50px;font-size:0.82rem;font-weight:600;margin-bottom:20px;letter-spacing:0.02em}
        .hero-badge .dot{width:7px;height:7px;border-radius:50%;background:#3b82f6;animation:pulse-dot 2s infinite}
        @keyframes pulse-dot{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(59,130,246,0.6)}50%{opacity:0.6;box-shadow:0 0 0 8px rgba(59,130,246,0)}}
        .hero h1{font-size:3rem;font-weight:900;color:#fff;margin-bottom:16px;letter-spacing:-0.03em;line-height:1.15}
        .hero h1 .highlight{background:linear-gradient(135deg,#60a5fa,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        @media(max-width:768px){.hero h1{font-size:2rem}}
        @media(max-width:520px){.hero h1{font-size:1.6rem}}
        .hero-desc{font-size:1.1rem;color:#cbd5e1;margin-bottom:28px;line-height:1.7}
        @media(max-width:768px){.hero-desc{font-size:0.95rem}}
        .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
        @media(max-width:900px){.hero-actions{justify-content:center}}
        .hero-actions .btn-primary{background:#fff;color:var(--primary);box-shadow:0 4px 20px rgba(255,255,255,0.2);font-weight:700}
        .hero-actions .btn-primary:hover{background:#f0f7ff;box-shadow:0 6px 28px rgba(255,255,255,0.3);transform:translateY(-2px)}
        .hero-actions .btn-outline-white{border:2px solid rgba(255,255,255,0.35);color:#fff;background:transparent;padding:10px 20px;border-radius:var(--radius);font-weight:600;font-size:0.9rem;transition:all var(--transition);display:inline-flex;align-items:center;gap:7px}
        .hero-actions .btn-outline-white:hover{border-color:#fff;background:rgba(255,255,255,0.08)}

        .hero-visual{display:flex;justify-content:center;align-items:center}
        @media(max-width:900px){.hero-visual{display:none}}
        .hero-dashboard{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:var(--radius-xl);padding:28px 24px;backdrop-filter:blur(4px);width:100%;max-width:440px}
        .hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}
        .hero-stat-card{background:rgba(255,255,255,0.05);border-radius:var(--radius);padding:16px;text-align:center;border:1px solid rgba(255,255,255,0.08)}
        .hero-stat-value{font-size:1.8rem;font-weight:900;color:#fff;font-family:var(--font-mono);letter-spacing:-0.02em}
        .hero-stat-label{font-size:0.75rem;color:#94a3b8;margin-top:4px;text-transform:uppercase;letter-spacing:0.06em}
        .hero-status-bar{display:flex;align-items:center;gap:8px;background:rgba(16,185,129,0.12);border:1px solid rgba(16,185,129,0.3);border-radius:var(--radius-sm);padding:10px 14px;font-size:0.82rem;color:#6ee7b7;font-weight:600}
        .hero-status-dot{width:8px;height:8px;border-radius:50%;background:#10b981;animation:pulse-dot 2s infinite}

        /* Sections */
        .section{padding:72px 0}
        @media(max-width:768px){.section{padding:44px 0}}
        .section-header{text-align:center;margin-bottom:44px}
        .section-label{display:inline-block;font-size:0.82rem;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:8px}
        .section-title{font-size:2rem;font-weight:800;color:var(--dark);margin-bottom:10px;letter-spacing:-0.02em}
        @media(max-width:768px){.section-title{font-size:1.5rem}}
        .section-subtitle{font-size:1rem;color:var(--text-muted);max-width:600px;margin:0 auto;line-height:1.6}

        /* Features Grid */
        .features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
        @media(max-width:900px){.features-grid{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.features-grid{grid-template-columns:1fr}}
        .feature-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 24px;transition:all var(--transition);position:relative;overflow:hidden}
        .feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:0;transition:opacity var(--transition)}
        .feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px);border-color:transparent}
        .feature-card:hover::before{opacity:1}
        .feature-icon{width:50px;height:50px;border-radius:var(--radius);background:var(--primary-soft);display:flex;align-items:center;justify-content:center;font-size:1.3rem;color:var(--primary);margin-bottom:16px;transition:all var(--transition)}
        .feature-card:hover .feature-icon{background:var(--primary);color:#fff;transform:scale(1.05)}
        .feature-card h3{font-size:1.1rem;font-weight:700;margin-bottom:8px;color:var(--dark)}
        .feature-card p{font-size:0.9rem;color:var(--text-muted);line-height:1.6}

        /* Category Entry */
        .category-entry-section{background:var(--bg-alt)}
        .category-entry-card{display:grid;grid-template-columns:1fr 1fr;gap:0;background:var(--card-bg);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);transition:all var(--transition)}
        .category-entry-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
        @media(max-width:768px){.category-entry-card{grid-template-columns:1fr}}
        .category-entry-image{position:relative;min-height:280px;overflow:hidden}
        .category-entry-image img{width:100%;height:100%;object-fit:cover;transition:transform 0.5s ease}
        .category-entry-card:hover .category-entry-image img{transform:scale(1.04)}
        .category-entry-image .overlay-tag{position:absolute;top:18px;left:18px;background:rgba(15,23,42,0.8);color:#fff;padding:6px 14px;border-radius:50px;font-size:0.78rem;font-weight:700;backdrop-filter:blur(4px);letter-spacing:0.03em}
        .category-entry-body{padding:32px 28px;display:flex;flex-direction:column;justify-content:center}
        @media(max-width:768px){.category-entry-body{padding:24px 20px}}
        .category-entry-body h3{font-size:1.5rem;font-weight:800;margin-bottom:10px;color:var(--dark)}
        .category-entry-body p{color:var(--text-muted);line-height:1.7;margin-bottom:18px;font-size:0.95rem}
        .category-entry-body .btn{margin-top:auto;align-self:flex-start}

        /* CMS List */
        .cms-list-section{}
        .cms-list{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
        @media(max-width:768px){.cms-list{grid-template-columns:1fr}}
        .cms-item{display:flex;gap:16px;background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px;transition:all var(--transition);cursor:pointer}
        .cms-item:hover{box-shadow:var(--shadow);border-color:var(--primary-light);transform:translateY(-2px)}
        @media(max-width:520px){.cms-item{flex-direction:column;gap:12px}}
        .cms-item-thumb{width:100px;height:80px;border-radius:var(--radius);overflow:hidden;flex-shrink:0;background:var(--bg-alt)}
        @media(max-width:520px){.cms-item-thumb{width:100%;height:140px}}
        .cms-item-thumb img{width:100%;height:100%;object-fit:cover}
        .cms-item-info{flex:1;min-width:0}
        .cms-item-info h4{font-size:0.95rem;font-weight:700;color:var(--dark);margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
        .cms-item-info .cms-item-excerpt{font-size:0.82rem;color:var(--text-muted);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:6px}
        .cms-item-meta{display:flex;align-items:center;gap:8px;font-size:0.75rem;color:var(--text-light)}
        .cms-item-tag{display:inline-block;background:var(--primary-soft);color:var(--primary);padding:3px 10px;border-radius:50px;font-size:0.7rem;font-weight:700}
        .cms-empty{text-align:center;padding:40px 20px;color:var(--text-muted);font-size:0.95rem;background:var(--card-bg);border-radius:var(--radius-lg);border:1px dashed var(--border)}

        /* Stats */
        .stats-section{background:linear-gradient(160deg,var(--dark) 0%,#1a2a4a 100%);color:#fff;position:relative;overflow:hidden}
        .stats-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:0.08;z-index:0}
        .stats-section .container{position:relative;z-index:1}
        .stats-section .section-title{color:#fff}
        .stats-section .section-subtitle{color:#94a3b8}
        .stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
        @media(max-width:900px){.stats-grid{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.stats-grid{grid-template-columns:1fr}}
        .stat-card{text-align:center;padding:28px 16px;background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);border-radius:var(--radius-lg);transition:all var(--transition)}
        .stat-card:hover{background:rgba(255,255,255,0.08);border-color:rgba(255,255,255,0.16);transform:translateY(-2px)}
        .stat-value{font-size:2.4rem;font-weight:900;font-family:var(--font-mono);letter-spacing:-0.03em;background:linear-gradient(135deg,#60a5fa,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        .stat-label{font-size:0.85rem;color:#94a3b8;margin-top:6px;font-weight:500}

        /* Process */
        .process-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
        @media(max-width:900px){.process-steps{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.process-steps{grid-template-columns:1fr}}
        .process-step{text-align:center;position:relative}
        .process-step-num{width:52px;height:52px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:800;margin:0 auto 16px;position:relative;z-index:1;box-shadow:0 4px 16px rgba(37,99,235,0.3)}
        .process-step h4{font-size:1rem;font-weight:700;margin-bottom:6px;color:var(--dark)}
        .process-step p{font-size:0.85rem;color:var(--text-muted);line-height:1.5}
        .process-connector{display:none}
        @media(min-width:901px){
            .process-steps::before{content:'';position:absolute;top:26px;left:12.5%;right:12.5%;height:2px;background:var(--border);z-index:0}
        }

        /* FAQ */
        .faq-section{background:var(--bg-alt)}
        .faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
        .faq-item{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all var(--transition)}
        .faq-item:hover{border-color:var(--primary-light)}
        .faq-q{padding:18px 20px;font-weight:700;font-size:0.95rem;color:var(--dark);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;user-select:none}
        .faq-q .faq-icon{width:28px;height:28px;border-radius:50%;background:var(--bg-alt);display:flex;align-items:center;justify-content:center;font-size:0.7rem;color:var(--text-muted);transition:all var(--transition);flex-shrink:0}
        .faq-item.active .faq-icon{background:var(--primary);color:#fff;transform:rotate(45deg)}
        .faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:all 0.35s ease;color:var(--text-muted);font-size:0.9rem;line-height:1.7}
        .faq-item.active .faq-a{padding:0 20px 18px;max-height:300px}

        /* CTA */
        .cta-section{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 50%,#1e40af 100%);color:#fff;text-align:center;position:relative;overflow:hidden}
        .cta-section::after{content:'';position:absolute;top:-80px;right:-80px;width:300px;height:300px;background:radial-gradient(circle,rgba(255,255,255,0.12) 0%,transparent 70%);pointer-events:none}
        .cta-section .container{position:relative;z-index:1}
        .cta-section .section-title{color:#fff}
        .cta-section .section-subtitle{color:#bfdbfe}
        .cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:24px}
        .cta-actions .btn-primary{background:#fff;color:var(--primary);font-weight:700;box-shadow:0 4px 20px rgba(0,0,0,0.15)}
        .cta-actions .btn-primary:hover{background:#f0f7ff;box-shadow:0 6px 28px rgba(0,0,0,0.22)}
        .cta-actions .btn-outline-white{border:2px solid rgba(255,255,255,0.5);color:#fff;padding:10px 20px;border-radius:var(--radius);font-weight:600;font-size:0.9rem;transition:all var(--transition);display:inline-flex;align-items:center;gap:7px}
        .cta-actions .btn-outline-white:hover{border-color:#fff;background:rgba(255,255,255,0.1)}

        /* Footer */
        .footer{background:var(--dark);color:#cbd5e1;padding:48px 0 24px}
        .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
        @media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
        @media(max-width:520px){.footer-grid{grid-template-columns:1fr}}
        .footer-brand .logo{color:#fff;margin-bottom:12px;font-size:1.2rem}
        .footer-brand p{font-size:0.85rem;color:#94a3b8;line-height:1.6;max-width:280px}
        .footer-col h4{color:#fff;font-size:0.9rem;font-weight:700;margin-bottom:14px;text-transform:uppercase;letter-spacing:0.04em}
        .footer-col ul{display:flex;flex-direction:column;gap:8px}
        .footer-col ul li a{font-size:0.85rem;color:#94a3b8;transition:color var(--transition)}
        .footer-col ul li a:hover{color:#fff}
        .footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:20px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:0.8rem;color:#64748b}
        @media(max-width:520px){.footer-bottom{flex-direction:column;text-align:center}}

        /* Responsive nav */
        @media(min-width:769px){.mobile-menu{display:none!important}}

/* roulang page: category1 */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --accent: #0ea5e9;
            --accent-light: #38bdf8;
            --success: #10b981;
            --success-bg: #ecfdf5;
            --warning: #f59e0b;
            --danger: #ef4444;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-secondary: #1e293b;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow: 0 4px 6px rgba(15, 23, 42, 0.05), 0 2px 4px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 10px 25px rgba(15, 23, 42, 0.07), 0 4px 10px rgba(15, 23, 42, 0.04);
            --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.1), 0 8px 20px rgba(15, 23, 42, 0.05);
            --shadow-xl: 0 25px 60px rgba(15, 23, 42, 0.12), 0 10px 30px rgba(15, 23, 42, 0.06);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.2s ease;
            --transition-slow: 0.35s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== HEADER ========== */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            transition: box-shadow var(--transition);
        }

        .header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .header-inner {
                padding: 0 16px;
            }
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text);
            white-space: nowrap;
            flex-shrink: 0;
            transition: opacity var(--transition);
        }

        .logo:hover {
            opacity: 0.85;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }

        .nav-link i {
            font-size: 0.7rem;
            transition: transform var(--transition);
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }

        .nav-link.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px 3px 0 0;
        }

        .nav-mega {
            position: relative;
        }

        .nav-mega>a.nav-link {
            cursor: pointer;
        }

        .mega-panel {
            position: absolute;
            top: calc(100% + 12px);
            left: 50%;
            transform: translateX(-50%) translateY(8px);
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            padding: 20px;
            min-width: 520px;
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition-slow);
            pointer-events: none;
            z-index: 999;
        }

        .nav-mega:hover .mega-panel,
        .nav-mega:focus-within .mega-panel {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
            pointer-events: auto;
        }

        .nav-mega:hover>a.nav-link i,
        .nav-mega:focus-within>a.nav-link i {
            transform: rotate(180deg);
        }

        .mega-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px;
        }

        .mega-card {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 14px 16px;
            border-radius: var(--radius);
            transition: all var(--transition);
            cursor: pointer;
        }

        .mega-card:hover {
            background: var(--primary-bg);
        }

        .mega-card-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1rem;
            flex-shrink: 0;
        }

        .mega-card-info h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 2px;
        }

        .mega-card-info span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            background: var(--bg-white);
            cursor: pointer;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--text);
            transition: all var(--transition);
            flex-shrink: 0;
        }

        .mobile-toggle:hover {
            background: var(--bg);
            border-color: var(--text-muted);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--bg-white);
            z-index: 998;
            padding: 16px 24px;
            overflow-y: auto;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu.active {
            display: flex;
        }

        .mobile-menu .nav-link {
            display: flex;
            width: 100%;
            padding: 14px 16px;
            font-size: 1.05rem;
            border-radius: var(--radius);
            justify-content: space-between;
        }

        .mobile-menu .mega-sub-items {
            padding-left: 16px;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .mobile-menu .mega-sub-items a {
            padding: 10px 14px;
            border-radius: var(--radius);
            font-size: 0.9rem;
            color: var(--text-secondary);
            display: block;
        }

        .mobile-menu .mega-sub-items a:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }

            .mobile-toggle {
                display: flex;
            }
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .separator {
            color: var(--text-light);
            font-size: 0.7rem;
        }

        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        /* ========== CATEGORY BANNER ========== */
        .category-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            min-height: 360px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.82) 0%, rgba(30, 41, 59, 0.7) 40%, rgba(37, 99, 235, 0.55) 100%);
            z-index: 1;
        }

        .category-banner .banner-content {
            position: relative;
            z-index: 2;
            padding: 60px 0;
            max-width: 700px;
        }

        .category-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }

        .category-banner .banner-badge i {
            color: var(--accent-light);
        }

        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .category-banner .banner-desc {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            margin-bottom: 28px;
        }

        .category-banner .banner-stats {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
        }

        .category-banner .banner-stat {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
        }

        .category-banner .banner-stat .stat-value {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--accent-light);
            line-height: 1;
        }

        .category-banner .banner-stat .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
        }

        @media (max-width: 768px) {
            .category-banner {
                min-height: 300px;
            }

            .category-banner h1 {
                font-size: 2rem;
            }

            .category-banner .banner-desc {
                font-size: 1rem;
            }

            .category-banner .banner-stats {
                gap: 20px;
            }

            .category-banner .banner-stat .stat-value {
                font-size: 1.4rem;
            }
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 64px 0;
        }

        .section-sm {
            padding: 40px 0;
        }

        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }

        .section-gray {
            background: #f1f5f9;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .section-dark .section-header h2 {
            color: #fff;
        }

        .section-header .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .section-dark .section-header .section-subtitle {
            color: var(--text-light);
        }

        @media (max-width: 768px) {
            .section {
                padding: 40px 0;
            }

            .section-header h2 {
                font-size: 1.5rem;
            }

            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ========== FEATURE CARDS ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: all var(--transition-slow);
            position: relative;
            overflow: hidden;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .feature-card .card-icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 18px;
            transition: transform var(--transition);
        }

        .feature-card:hover .card-icon-wrap {
            transform: scale(1.08);
        }

        .feature-card .icon-blue {
            background: #eff6ff;
            color: #2563eb;
        }

        .feature-card .icon-cyan {
            background: #ecfeff;
            color: #0ea5e9;
        }

        .feature-card .icon-green {
            background: #ecfdf5;
            color: #10b981;
        }

        .feature-card .icon-purple {
            background: #f5f3ff;
            color: #7c3aed;
        }

        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .feature-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--primary);
            transition: gap var(--transition);
        }

        .feature-card .card-link:hover {
            gap: 10px;
        }

        /* ========== ARTICLE LIST ========== */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        @media (max-width: 1024px) {
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        .article-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition-slow);
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .article-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }

        .article-card .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-card .card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            margin-bottom: 10px;
        }

        .article-card .card-tag {
            font-size: 0.75rem;
            padding: 3px 10px;
            border-radius: 50px;
            background: var(--primary-bg);
            color: var(--primary);
            font-weight: 500;
        }

        .article-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .article-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
            flex: 1;
        }

        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 14px;
            font-size: 0.8rem;
            color: var(--text-light);
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        /* ========== STATS BAR ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 24px;
            text-align: center;
            transition: all var(--transition);
        }

        .stat-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.2);
        }

        .stat-card .stat-icon {
            font-size: 1.5rem;
            color: var(--accent-light);
            margin-bottom: 10px;
        }

        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: #fff;
            line-height: 1;
            margin-bottom: 6px;
        }

        .stat-card .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* ========== PROCESS STEPS ========== */
        .process-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            max-width: 800px;
            margin: 0 auto;
        }

        .process-step {
            display: flex;
            gap: 20px;
            position: relative;
            padding-bottom: 32px;
        }

        .process-step:last-child {
            padding-bottom: 0;
        }

        .process-step::after {
            content: '';
            position: absolute;
            left: 22px;
            top: 50px;
            bottom: 0;
            width: 2px;
            background: var(--border);
        }

        .process-step:last-child::after {
            display: none;
        }

        .process-step .step-marker {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
            position: relative;
            z-index: 1;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .process-step .step-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
        }

        .process-step .step-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        @media (max-width: 520px) {
            .process-step {
                gap: 14px;
                padding-bottom: 24px;
            }

            .process-step .step-marker {
                width: 36px;
                height: 36px;
                font-size: 0.9rem;
            }

            .process-step::after {
                left: 17px;
                top: 40px;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text);
            text-align: left;
            gap: 16px;
            transition: color var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 22px 18px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section>* {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            white-space: nowrap;
        }

        .btn-white {
            background: #fff;
            color: var(--primary);
        }

        .btn-white:hover {
            background: #f1f5f9;
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .btn-outline-white {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }

        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .btn-lg {
            padding: 15px 36px;
            font-size: 1.05rem;
        }

        .cta-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 36px 24px;
            }

            .cta-section h2 {
                font-size: 1.4rem;
            }
        }

        /* ========== FOOTER ========== */
        .footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 56px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        .footer-brand .logo {
            margin-bottom: 14px;
        }

        .footer-brand .logo span {
            color: #fff;
        }

        .footer-brand p {
            font-size: 0.875rem;
            color: var(--text-light);
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 14px;
            color: #fff;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.875rem;
            color: var(--text-light);
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.8rem;
            color: var(--text-light);
            flex-wrap: wrap;
            gap: 8px;
        }

        @media (max-width: 520px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ========== UTILITIES ========== */
        .text-center {
            text-align: center;
        }

        .mt-0 {
            margin-top: 0;
        }

        .mb-0 {
            margin-bottom: 0;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ========== FOCUS ========== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 2px;
        }

/* roulang page: article */
:root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #3b82f6;
            --color-accent: #06b6d4;
            --color-accent-dark: #0891b2;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --color-bg: #f1f5f9;
            --color-surface: #ffffff;
            --color-surface-alt: #f8fafc;
            --color-dark: #0f172a;
            --color-dark-secondary: #1e293b;
            --color-text: #1e293b;
            --color-text-secondary: #475569;
            --color-text-muted: #64748b;
            --color-text-light: #94a3b8;
            --color-text-on-dark: #e2e8f0;
            --color-text-on-dark-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-border-dark: #cbd5e1;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
            --shadow-glow: 0 0 24px rgba(37,99,235,0.18);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --container-max: 1200px;
            --container-narrow: 800px;
            --header-height: 68px;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
        body{font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--color-text);background:var(--color-bg);min-height:100vh;display:flex;flex-direction:column}
        a{color:inherit;text-decoration:none;transition:color var(--transition-fast)}
        img{max-width:100%;height:auto;display:block}
        button,input,select,textarea{font-family:inherit;font-size:inherit}
        button{cursor:pointer;border:none;background:none}
        ul,ol{list-style:none}
        h1,h2,h3,h4,h5,h6{line-height:1.3;font-weight:700}
        .container{width:100%;max-width:var(--container-max);margin:0 auto;padding:0 24px}
        .container-narrow{width:100%;max-width:var(--container-narrow);margin:0 auto;padding:0 24px}

        /* Header */
        .header{position:sticky;top:0;z-index:1000;background:var(--color-dark);border-bottom:1px solid rgba(255,255,255,0.08);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);transition:box-shadow var(--transition-base)}
        .header.scrolled{box-shadow:0 4px 24px rgba(0,0,0,0.35)}
        .header-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--container-max);margin:0 auto;padding:0 24px;height:var(--header-height);gap:32px}
        .logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.2rem;color:#fff;white-space:nowrap;flex-shrink:0;transition:opacity var(--transition-fast)}
        .logo:hover{opacity:0.85}
        .logo-icon{width:38px;height:38px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border-radius:var(--radius-md);font-size:1rem;color:#fff;flex-shrink:0}
        .logo span{letter-spacing:-0.01em}

        /* Desktop Nav */
        .nav-desktop{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
        .nav-link{display:inline-flex;align-items:center;gap:6px;padding:10px 16px;font-size:0.925rem;font-weight:500;color:var(--color-text-on-dark-muted);border-radius:var(--radius-sm);transition:all var(--transition-fast);white-space:nowrap;position:relative}
        .nav-link:hover{color:#fff;background:rgba(255,255,255,0.06)}
        .nav-link.active{color:#fff;background:rgba(37,99,235,0.25);font-weight:600}
        .nav-link i{font-size:0.75rem;transition:transform var(--transition-fast)}
        .nav-mega{position:relative}
        .nav-mega>.nav-link{cursor:default}
        .nav-mega:hover>.nav-link{color:#fff;background:rgba(255,255,255,0.06)}
        .nav-mega:hover>.nav-link i{transform:rotate(180deg)}
        .mega-panel{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:20px;min-width:560px;opacity:0;visibility:hidden;pointer-events:none;transition:all var(--transition-base);border:1px solid var(--color-border);z-index:100}
        .nav-mega:hover .mega-panel{opacity:1;visibility:visible;pointer-events:auto;top:calc(100% + 4px)}
        .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
        .mega-card{display:flex;align-items:flex-start;gap:14px;padding:14px 16px;border-radius:var(--radius-md);transition:all var(--transition-fast);color:var(--color-text);background:transparent}
        .mega-card:hover{background:var(--color-surface-alt);box-shadow:var(--shadow-sm)}
        .mega-card-icon{width:42px;height:42px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eff6ff,#e0f2fe);border-radius:var(--radius-sm);font-size:1.05rem;color:var(--color-primary);flex-shrink:0}
        .mega-card-info h4{font-size:0.925rem;font-weight:600;margin-bottom:3px;color:var(--color-text)}
        .mega-card-info span{font-size:0.8rem;color:var(--color-text-muted)}

        /* Mobile Menu Toggle */
        .mobile-menu-btn{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer;z-index:1001;background:transparent;border:none}
        .mobile-menu-btn span{display:block;width:26px;height:2.5px;background:#fff;border-radius:2px;transition:all var(--transition-fast)}
        .mobile-menu-btn.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
        .mobile-menu-btn.active span:nth-child(2){opacity:0}
        .mobile-menu-btn.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

        /* Article Banner */
        .article-banner{position:relative;background:linear-gradient(160deg,var(--color-dark) 0%,#1a2744 40%,#16203a 100%);background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;background-blend-mode:overlay;padding:56px 0 48px;overflow:hidden}
        .article-banner::before{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,23,42,0.75) 0%,rgba(15,23,42,0.9) 100%);z-index:1}
        .article-banner::after{content:'';position:absolute;top:-60%;right:-20%;width:500px;height:500px;background:radial-gradient(circle,rgba(37,99,235,0.15) 0%,transparent 70%);z-index:0;border-radius:50%}
        .article-banner .container{position:relative;z-index:2}
        .banner-category-tag{display:inline-flex;align-items:center;gap:7px;background:rgba(37,99,235,0.3);color:#93c5fd;padding:6px 14px;border-radius:var(--radius-full);font-size:0.85rem;font-weight:600;margin-bottom:16px;border:1px solid rgba(147,197,253,0.25);letter-spacing:0.02em}
        .banner-category-tag .dot{width:8px;height:8px;background:var(--color-accent);border-radius:50%;animation:pulse-dot 2s infinite}
        @keyframes pulse-dot{0%,100%{opacity:1}50%{opacity:0.4}}
        .article-banner h1{font-size:2rem;font-weight:800;color:#fff;line-height:1.3;margin-bottom:14px;letter-spacing:-0.01em}
        .banner-meta{display:flex;align-items:center;gap:18px;flex-wrap:wrap;color:var(--color-text-on-dark-muted);font-size:0.875rem}
        .banner-meta span{display:inline-flex;align-items:center;gap:6px}
        .banner-meta i{font-size:0.9rem;opacity:0.7}

        /* Breadcrumb */
        .breadcrumb-wrap{padding:16px 0;background:var(--color-surface);border-bottom:1px solid var(--color-border)}
        .breadcrumb{display:flex;align-items:center;gap:8px;font-size:0.85rem;color:var(--color-text-muted);flex-wrap:wrap}
        .breadcrumb a{color:var(--color-text-secondary);transition:color var(--transition-fast)}
        .breadcrumb a:hover{color:var(--color-primary)}
        .breadcrumb .sep{color:var(--color-text-light);font-size:0.7rem}
        .breadcrumb .current{color:var(--color-text);font-weight:500}

        /* Main Content Area */
        .main-content{padding:48px 0 56px;background:var(--color-bg)}
        .content-layout{display:grid;grid-template-columns:1fr 320px;gap:36px;align-items:start}
        .article-card{background:var(--color-surface);border-radius:var(--radius-xl);padding:40px;box-shadow:var(--shadow-md);border:1px solid var(--color-border-light)}
        .article-body{font-size:1.05rem;line-height:1.85;color:var(--color-text);word-break:break-word}
        .article-body p{margin-bottom:1.25em}
        .article-body h2{font-size:1.5rem;margin:2em 0 0.75em;color:var(--color-dark-secondary);padding-bottom:0.5em;border-bottom:2px solid var(--color-border-light)}
        .article-body h3{font-size:1.25rem;margin:1.75em 0 0.6em;color:var(--color-dark-secondary)}
        .article-body h4{font-size:1.1rem;margin:1.5em 0 0.5em;color:var(--color-text)}
        .article-body ul,.article-body ol{margin:1em 0;padding-left:1.5em}
        .article-body li{margin-bottom:0.5em}
        .article-body ul li{list-style-type:disc}
        .article-body ol li{list-style-type:decimal}
        .article-body blockquote{margin:1.5em 0;padding:18px 24px;background:var(--color-surface-alt);border-left:4px solid var(--color-primary);border-radius:0 var(--radius-md) var(--radius-md) 0;color:var(--color-text-secondary);font-style:italic}
        .article-body code{background:#f1f5f9;padding:3px 8px;border-radius:4px;font-family:var(--font-mono);font-size:0.9em;color:#1e293b}
        .article-body pre{background:var(--color-dark);color:#e2e8f0;padding:20px 24px;border-radius:var(--radius-md);overflow-x:auto;margin:1.5em 0;font-family:var(--font-mono);font-size:0.9em;line-height:1.6}
        .article-body pre code{background:transparent;padding:0;color:inherit;font-size:inherit}
        .article-body img{border-radius:var(--radius-md);margin:1.5em auto;box-shadow:var(--shadow-md)}
        .article-body a{color:var(--color-primary);text-decoration:underline;text-underline-offset:3px}
        .article-body a:hover{color:var(--color-primary-dark)}
        .article-body strong{font-weight:700;color:var(--color-dark-secondary)}
        .article-body table{width:100%;border-collapse:collapse;margin:1.5em 0;font-size:0.95rem}
        .article-body th,.article-body td{padding:12px 16px;border:1px solid var(--color-border);text-align:left}
        .article-body th{background:var(--color-surface-alt);font-weight:600}

        /* Sidebar */
        .sidebar{display:flex;flex-direction:column;gap:24px;position:sticky;top:calc(var(--header-height) + 24px)}
        .sidebar-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm);border:1px solid var(--color-border-light)}
        .sidebar-card h4{font-size:1rem;font-weight:700;margin-bottom:16px;color:var(--color-dark-secondary);display:flex;align-items:center;gap:8px}
        .sidebar-card h4 i{color:var(--color-primary);font-size:0.9rem}
        .tag-list{display:flex;flex-wrap:wrap;gap:8px}
        .tag{display:inline-block;padding:6px 14px;background:var(--color-surface-alt);border-radius:var(--radius-full);font-size:0.8rem;font-weight:500;color:var(--color-text-secondary);transition:all var(--transition-fast);border:1px solid transparent}
        .tag:hover{background:#eff6ff;color:var(--color-primary);border-color:var(--color-primary);box-shadow:var(--shadow-sm)}
        .sidebar-link-list li{border-bottom:1px solid var(--color-border-light)}
        .sidebar-link-list li:last-child{border-bottom:none}
        .sidebar-link-list a{display:block;padding:10px 0;font-size:0.9rem;color:var(--color-text-secondary);transition:all var(--transition-fast)}
        .sidebar-link-list a:hover{color:var(--color-primary);padding-left:6px}

        /* Related Posts */
        .related-section{padding:56px 0;background:var(--color-surface-alt)}
        .section-header{margin-bottom:36px}
        .section-header h2{font-size:1.65rem;font-weight:800;color:var(--color-dark-secondary);display:flex;align-items:center;gap:10px}
        .section-header h2 .icon-mark{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border-radius:var(--radius-sm);color:#fff;font-size:0.9rem}
        .section-header p{color:var(--color-text-muted);font-size:0.925rem;margin-top:6px}
        .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
        .related-card{background:var(--color-surface);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--color-border-light);transition:all var(--transition-base);display:flex;flex-direction:column}
        .related-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);border-color:var(--color-border-dark)}
        .related-card-img{aspect-ratio:16/10;overflow:hidden;background:var(--color-surface-alt)}
        .related-card-img img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}
        .related-card:hover .related-card-img img{transform:scale(1.06)}
        .related-card-body{padding:18px 20px 20px;flex:1;display:flex;flex-direction:column}
        .related-card-tag{display:inline-block;font-size:0.75rem;font-weight:600;color:var(--color-primary);background:#eff6ff;padding:3px 10px;border-radius:var(--radius-full);margin-bottom:10px;width:fit-content}
        .related-card h3{font-size:1rem;font-weight:700;color:var(--color-dark-secondary);margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .related-card p{font-size:0.85rem;color:var(--color-text-muted);line-height:1.5;flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .related-card-meta{font-size:0.78rem;color:var(--color-text-light);margin-top:10px;display:flex;align-items:center;gap:6px}

        /* CTA Section */
        .cta-section{padding:60px 0;background:linear-gradient(160deg,var(--color-dark) 0%,#1a2744 100%);position:relative;overflow:hidden}
        .cta-section::before{content:'';position:absolute;bottom:-30%;right:-15%;width:400px;height:400px;background:radial-gradient(circle,rgba(6,182,212,0.12) 0%,transparent 70%);border-radius:50%;z-index:0}
        .cta-section .container{position:relative;z-index:1;text-align:center}
        .cta-section h2{font-size:1.8rem;font-weight:800;color:#fff;margin-bottom:12px}
        .cta-section p{color:var(--color-text-on-dark-muted);font-size:1.05rem;margin-bottom:28px;max-width:540px;margin-left:auto;margin-right:auto}
        .btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;font-size:0.95rem;font-weight:600;border-radius:var(--radius-full);transition:all var(--transition-base);letter-spacing:0.01em}
        .btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;box-shadow:0 4px 16px rgba(37,99,235,0.35)}
        .btn-primary:hover{box-shadow:0 6px 24px rgba(37,99,235,0.5);transform:translateY(-2px)}
        .btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,0.35)}
        .btn-outline:hover{background:rgba(255,255,255,0.08);border-color:rgba(255,255,255,0.6)}
        .btn-lg{padding:15px 34px;font-size:1rem}

        /* Not Found State */
        .not-found-state{text-align:center;padding:48px 24px}
        .not-found-state .icon-circle{width:80px;height:80px;margin:0 auto 20px;background:var(--color-surface-alt);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:2rem;color:var(--color-text-muted)}
        .not-found-state h3{font-size:1.4rem;color:var(--color-dark-secondary);margin-bottom:8px}
        .not-found-state p{color:var(--color-text-muted);margin-bottom:20px}

        /* Footer */
        .footer{background:var(--color-dark);color:var(--color-text-on-dark);padding:56px 0 28px;margin-top:auto}
        .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px}
        .footer-brand .logo{margin-bottom:14px}
        .footer-brand p{color:var(--color-text-on-dark-muted);font-size:0.9rem;line-height:1.7;max-width:280px}
        .footer-col h4{color:#fff;font-size:0.95rem;font-weight:700;margin-bottom:16px;letter-spacing:0.02em}
        .footer-col ul{display:flex;flex-direction:column;gap:8px}
        .footer-col a{color:var(--color-text-on-dark-muted);font-size:0.875rem;transition:color var(--transition-fast)}
        .footer-col a:hover{color:#fff}
        .footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding-top:24px;border-top:1px solid rgba(255,255,255,0.1);font-size:0.82rem;color:var(--color-text-on-dark-muted)}

        /* Responsive */
        @media (max-width:1024px){
            .content-layout{grid-template-columns:1fr;gap:28px}
            .sidebar{position:static;flex-direction:row;flex-wrap:wrap;gap:16px}
            .sidebar-card{flex:1;min-width:240px}
            .related-grid{grid-template-columns:repeat(2,1fr)}
            .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
            .mega-panel{min-width:440px}
        }
        @media (max-width:768px){
            :root{--header-height:60px}
            .header-inner{padding:0 16px;gap:16px}
            .mobile-menu-btn{display:flex}
            .nav-desktop{position:fixed;top:var(--header-height);left:0;right:0;background:var(--color-dark);flex-direction:column;padding:16px;gap:4px;border-top:1px solid rgba(255,255,255,0.08);box-shadow:var(--shadow-xl);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);transition:all var(--transition-base);z-index:999;max-height:calc(100vh - var(--header-height));overflow-y:auto}
            .nav-desktop.open{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
            .nav-link{width:100%;padding:12px 16px;font-size:0.95rem}
            .mega-panel{position:static;transform:none;min-width:auto;opacity:1;visibility:visible;pointer-events:auto;box-shadow:none;border:none;padding:8px 0 8px 16px;background:transparent;border-radius:0}
            .mega-grid{grid-template-columns:1fr;gap:6px}
            .mega-card{background:rgba(255,255,255,0.03);border-radius:var(--radius-sm);padding:12px 14px}
            .mega-card:hover{background:rgba(255,255,255,0.06);box-shadow:none}
            .mega-card-icon{background:rgba(255,255,255,0.08);color:#93c5fd}
            .mega-card-info h4{color:#fff}
            .mega-card-info span{color:var(--color-text-on-dark-muted)}
            .nav-mega:hover>.nav-link i{transform:none}
            .article-banner{padding:36px 0 32px}
            .article-banner h1{font-size:1.5rem}
            .article-card{padding:24px 20px;border-radius:var(--radius-lg)}
            .article-body{font-size:1rem}
            .related-grid{grid-template-columns:1fr}
            .related-section{padding:36px 0}
            .cta-section{padding:40px 0}
            .cta-section h2{font-size:1.4rem}
            .footer-grid{grid-template-columns:1fr;gap:24px}
            .footer-bottom{flex-direction:column;text-align:center}
            .sidebar{flex-direction:column}
        }
        @media (max-width:520px){
            .container,.container-narrow{padding:0 14px}
            .article-banner h1{font-size:1.25rem}
            .banner-meta{font-size:0.8rem;gap:10px}
            .article-card{padding:18px 14px}
            .btn-lg{padding:12px 24px;font-size:0.9rem}
            .mega-panel{min-width:auto}
        }